has the Neato D85 on sale for $449.99. Get the 20% off coupon here [bedbathandbeyond.com]
which bring's total down to $359.99 with Free Shipping. I believe this is the lowest price ever for this specific model and vacuum.
This vacuum movement is far smarter than any Roomba using it's laser mapping technology and has non-random pattern of vacuuming the room. It also doesn't get stuck as easily as Roomba when it encounters cords.